According to the case, the source of the law is a Statute, because a statute is a written enactment, where the local authority presents statutes that order or prohibit certain actions, that are generally published in a visible manner where all people can see or access them. And the set of statutes is published in codes, so the people can consult them.
But by other side, although a regulation is a norm that establishes and delimits the actions in different aspects, nevertheless, they are promulgated at a general level in the country made by governmental agencies. And with respect to jurisprudence, although it is a set of rulings that are pronounced on specific aspects, however, they are promulgated by the tribunals and not by the local legislation bodies.
So for that reasons, the correct answer is a Statute.